In this study, Polysulfone (PSf)/Poly (butylene succinate) (PBS) blended membranes are prepared by solution casting and solvent evaporation, with varying blend ratios of 5 and 10 wt% of PBS. FESEM, DSC, and FTIR analyses confirm the homogeneity, miscibility, and molecular interactions of the polymer blends. Furthermore, when PBS is added into the PSf, the crystalline region of PBS and overall mechanical properties decrease, and the peak in the amorphous region shifts to a lower angle, indicating increased d-spacing. At 5 and 10 wt% of PBS, CO2/CH4 selectivity is increased by 187% and 43%, respectively, with corresponding enhancements in pure CO2 permeance; at 5 wt%, pure CH4 permeance decreases, while at 10 wt%, it increases, showcasing the PSf/PBS blended membranes\\\\\\\\\\\\\\\' good selectivity and permeability. A 60-day burial in compost is performed to investigate blended membranes\\\\\\\\\\\\\\\' biodegradability. The blended membranes show limited weight reductions due to biodegradation.

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